A top adviser for Sen. Barack Obama (D-Ill.) said Friday that Sen. Hillary Rodham Clinton (D-N.Y.), the front-runner for her party’s presidential nomination, is obsessed “with what she calls the Republican attack machine.” “I think we need a candidate who is obsessed with unifying this country again,” said Obama adviser David Axelrod. He added that Obama could break “the sort of decades-long battle we’ve had over this jagged divide — red state, blue state, American against American — and try to bring people together and attract disaffected Republicans and attract independent voters so that we could build not just a...